In your child project, verify the following: -
“create clean” your child project. make sure that all dll and pdb files have been deleted from the bin \ debug folder in the child project.
create your child project by clicking the build or ctrl-shift-b command. Please do not hit F5, as for some reason it does not receive the latest version of dll and pdb.
make sure you don’t have a reference to the release build of the parent dll, sometimes it caused problems for me depending on the configuration of the release build for this project. This should be the Debug assembly configuration for the parent project, and you must add the link from the debug folder or use the "Reference Path" in visual studio.
Now you can start the project by pressing F5.
Hope this helps.
Nabheet
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